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5 votes

How can I identify the material of this mystery gear?

Thanks to @DrMoishe Pippik for the suggestion to perform hardness testing on the gear. I don't have easy access to a hardness testing machine, but tested against some household objects of known ...
hifkanotiks's user avatar
2 votes

How to identify salts using mutual reactions

I will try to follow Poutnik's suggestion. And try to recognize the solutions without using external reagents. The only allowed mixtures are made by mixing two unknown solutions. Let's consider for ...
Maurice's user avatar
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1 vote

How to identify salts using mutual reactions

This task is a typical sort of problem used in the International Chemistry Olympiads. It allows you to quickly judge if the candidate knows the main reactions of usual ions. It looks like you have ten ...
Maurice's user avatar
  • 28.6k
2 votes
Accepted

How to identify salts using mutual reactions

I understand the task as there cannot be used external means, just reactions between contents of different tubes. I can be wrong, of course. In such a case, the optimal solution would be rather in the ...
Poutnik's user avatar
  • 42.2k
14 votes

How can I identify the material of this mystery gear?

Your idea of checking density is good, but consider the accuracy of your results. For a small part, errors in measurement due to meniscus of water in a cylinder, or sticking to the container or gear, ...
DrMoishe Pippik's user avatar
21 votes

How can I identify the material of this mystery gear?

Xray Fluorescence This may sound like some massive "Oh sure, I'll just hop over to the nearest government lab and ask for some beamtime!" overkill suggestion, but in fact handheld XRF ...
DotCounter's user avatar

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